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单词 Multipath interference
释义

Multipath interference

中文百科

多路径干扰

多路径干扰(Multipath interference)是一无线通信领域名词,指无线电信号分割为二或多个信号的副本,经过复数以上的路径抵达接收天线,有时在特定的状态下,这些信号波会产生干涉。大气层对电波的散射、电离层对电波的反射和折射,以及山峦、建筑等地表物体对电波的反射都会造成多径传播。无线电视收讯时的鬼影(ghosting)现象,就是一种常见的多径干扰具体表现。

无线传输环境中无线电波会受到周遭的物体反射产生数个反射波,我们称之为多重路径波(multipath wave),这些多重路径波之间到达接收端会有些许的时间差,当延迟时间过长的时候甚至会干扰到下一个发送信号,造成符号间干扰。同时因为每个反射波通过的路径不同,会影响其到达接收端时的相位以及振幅,所以接收天线混合这些信号时,在相位以及振幅会有失真的现象,称为「衰落」。除了时间的延迟会造成信号的衰落外,发送端与接收端以及周遭物体的移动速率也会对衰落的特性造成影响。

英语百科

Multipath interference 多路径干扰

Coherent waves that travel along two different paths will arrive with phase shift, hence interfering with each other.
In this illustration, an object (in this case an aircraft) pollutes the system by adding a second path. The signal arrives at RX by means 
of two different paths which have different lengths. The main path is the direct path, while the second is due to a reflection from the plane.

Multipath interference is a phenomenon in the physics of waves whereby a wave from a source travels to a detector via two or more paths and, under the right condition, the two (or more) components of the wave interfere. Multipath interference is a common cause of "ghosting" in analog television broadcasts.

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更新时间:2025/6/18 11:24:46